it is needed for the navigation. current implementation did catch it from the treeview and propagate it to the live search entry.
event->keyval == GDK_Control_R)
return FALSE;
+ /* dont forward the arrow up/down key to the entry, it is needed for
+ * navigation in the treeview */
+ if (event->keyval == GDK_Up || event->keyval == GDK_Down)
+ return FALSE;
+
/* realize the widget if it is not realized yet */
gtk_widget_realize (priv->search_entry);
if (!gtk_widget_has_focus (priv->search_entry))